ISPConfig version 18.104.22.168 Current servers Debian 6.0.10 (Squeeze) Planned new server Debian 7.x (Wheezy) I need to migrate user websites to newer versions of PHP. I plan to do this by adding a new server running Debian Wheezy and adding it as web server to ISPConfig cluster. Is this a good plan? I mean, the two web servers are then running different OS versions, is this a problem? Is there a better way to migrate users to new version of PHP and other tools that come with the OS?